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Rec. ITU-R BT.1617 1
RECOMMENDATION ITU-R BT.1617
Format for transmission of DV compressed video, audio and data over interfaces complying with Recommendation ITU-R BT.1381
(Question ITU-R 12/6)
(2003)
The ITU Radiocommunication Assembly,
considering
a) that applications within professional television production and post-production have been identified where DV-compliant video compression can offer operational and economic advantages when used on serial digital interface (SDI)-based operations;
b) that an implementation exists based on a sampling raster of 4:2:0 at a data rate of 25 Mbit/s based on IEC 61834-2 known as DVCAM;
c) that the audio, data and compressed video elements in DV-compliant systems are formatted differently compared to DV-based systems;
d) that the formatting is optimized for interconnection between DV-compliant VCRs and disk systems;
e) that transfer speeds up to five times faster than real-time can be achieved;
f) that agile decoders are being developed to integrate data streams based on DVCAM into DV-based production,
recommends
1 that for applications in professional television production and post-production employing DV compression, the parameters given in the SMPTE 322M-1999 – Format for Transmission of DV Compressed Video, Audio and Data Over a Serial Data Transport Interface, be used.
Summary of SMPTE Standard 322M-1999
This Standard specifies the data structure and the transmission format of DV compressed video, audio and data over a serial data transport interface (SDTI) as defined by Recommendation ITU-R BT.1381 and SMPTE 305M. The Standard is a combination of video, audio, sub-code and control data optimized for the connection between DV-compliant VCRs and disk systems. It provides for high-speed data stream transfer up to five times faster than real-time. The video, audio and sub-code data comply with IEC 61834-2 for both 525/60 and 625/50 systems. The bit stream consists of 77-byte digital interface (DIF) data blocks, which are common to other DV-based signals. The DIF blocks are mapped onto SDTI using a frame-bounded algorithm preserving ease of manipulating the video and audio data.
2 Rec. ITU-R BT.1617
NOTE 1 − SMPTE Standard 322M-1999 is given in Annex 1 and Standard 305M can be found at: http://ties.itu.int/u/itu-r/ede/rsg6/SMPTE/. SMPTE Standard 322M-1999 and its summary refer to version 1999 only, which is the version approved, by Administrations of Member States of the ITU in application of Resolution ITU-R 1-3 on 03-05-03. By agreement between ITU and SMPTE, this Version was provided and authorized for use by SMPTE and accepted by ITU-R for inclusion in this Recommandation. Any subsequent version of SMPTE Standard 322M, which has not been accepted and approved by Radiocommunication Study Group 6 is not part of this Recommendation. For subsequent versions of SMPTE documents, the reader should consult the SMPTE website: http://www.smpte.org/.
Rec. ITU-R BT.1617 3 Annex 1
Table of contents
1 Scope2 Norm ative references3 SDTI header data4 Data structure5 Transm ission form at
1 Scope
This standard specifies the data structure and thetransm ission form at of DV com pressed video, audio,and data over a serial data transport interface (SDTI[SM PTE 305M ] ). The standard is a com bination of video,audio, subcode, and control data optim ized for theconnection between DV-com pliant VCRs and disksystem s. It ensures high-speed data stream transfer upto five tim es faster than real tim e. The video, audio, andsubcode data com ply with IEC 61834-2 for both 525/60and 625/50 system s. The bit stream consists of 77-byteDIF data blocks, which are com m on to other DV basedsignals. The DIF blocks are m apped onto SDTI using afram e-bounded algorithm preserving ease of m anipulat-ing the video and audio data.
The layers of signal processing and related standardsare shown in figure 1.
NOTE -- For descriptions of the SDTI, refer to SM PTE 305M ,and for descriptions of video, audio, and subcode data, referto IEC 61834-2. The standard corresponds to data type[241h] registered as DVCAM - 1 in SM PTE 305M .
2 Norm ative references
The following standards contain provisions which,through reference in this text, constitute provisions ofthis standard. At the tim e of publication, the editionsindicated were valid. All standards are subject to
revision, and parties to agreem ents based on thisstandard are encouraged to investigate the possibilityof applying the m ost recent edition of the standardsindicated below.
SM PTE 305M -1998, Television ---- Serial Data Trans-port Interface
IEC 61834-2 (1998-08), Recording ---- Helical-ScanDigital Video Cassette Recording System Using 6,35m m M agnetic Tape for Consum er Use (525-60, 625-50,1125-60 and 1250-50 System s) ---- Part 2: SDForm at for 525-60 and 625-50 System s
3 SDTI header data
The SDTI header data as specified in SM PTE 305Mshall contain the param eters shown in table 1, andshall be repeated on every line. The SDTI header datastructure is as shown in figure 2.
4 Data structure
The following clause describes the basic data struc-ture and the system param eters of the bit stream . Thedata structure of the SDTI payload is shown in figure3. The data block consists of a control data block andfive vertical data slots, in which one com pressed videostream shall be contained. The em pty space andreserved area shall be set to all zeros (200h) as defaultvalue.
4.1 Data block
The control data block and the DIF data shall becontained in B0 (LSB) through B7 (8 bits). B8 shall bea reserved data bit for future expansion, which isnorm ally set to zero. B9 shall be the com plem ent ofB8.
forTelevision ----
Form at for Transm ission of DVCom pressed Video, Audio and DataOver a Serial Data Transport Interface
SM PTE 322M -1999SM PTE STANDARD
Page 1 of 13 pages
ApprovedDecem ber 7, 1999
Copyright © 1999 by THE SOCIETY OF M OTION PICTURE AND TELEVISION ENGINEERS595 W . Hartsdale Ave., W hite Plains, NY 10607(914) 761-1100
4 Rec. ITU-R BT.1617
Figure 1 -- Layers of signal processing and related standards
Param eters Length Value ADF DID SDID DC Line num ber Line num ber CRC Code AAI Destination address Source address Block type CRC flag Data extension flag Reserved data Header CRC CS
3 words 1 word 1 word 1 word 2 words 2 words 4 bits 4 bits 16 words 16 words 1 word 1 word 1 word 4 words 2 words 1 word
[000h][3FFh][3FFh] [140h] [101h] [22Eh]--------
[1h]------------
[1C1h] [101h] [200h] [200h][200h][200h][200h]--------
Table 1 -- Header data packet
Figure 2 -- SDTI header data structure
SM PTE 322M -1999
Page 2 of 13 pages
Rec. ITU-R BT.1617 5
4.2 Data block header
The data block header, as specified in SM PTE 305M ,shall contain the param eters shown in table 2. Thedata block header shall exist on line 12 for the 525/60system or line 8 for the 625/50 system (refer to figures4 and 7).
4.3 Control data block
Followed by the data block header, a control datablock shall be inserted (im m ediately after the SDTIdata block header). The control data block shall con-sist of 10 words (see figure 2), and the bits areallocated as shown in table 3. The control data blockhas som e areas of com m onality with the headersection specified in IEC 61834-2, and also provides
specific data required for data transfer betweenstorage devices.
Byte 1: Indicates the data type (secondary).
Byte 2: Indicates the transfer conditions (transferspeed, locked/unlocked, audio and video validity).
Bytes 3-10: Com m on inform ation to IEC 61834-2.
4.3.1 Secondary data type
The control data block and the data slots are precededwith a secondary data type (1 word), with which theentire data block is defined. The initial code shall beset to all zero, and the receiver shall attem pt to decodethe data as soon as the desired secondary data typeis detected.
Value Description
0000 0000 0000 0001 0000 0010
| 1111 1111
Initial codeData block as defined
Reserved
Figure 3 -- Data structure
Param eters Length Value Separator Data type W ordcount
1 word 1 word 4 words
[309h] [241h] [B4720h] (525/60 system ) [D8F50h] (625/50 system )
Table 2 -- Data block header
SM PTE 322M -1999
Page 3 of 13 pages
6 Rec. ITU-R BT.1617
4.3.2 Transfer m ode
The transfer m ode specifies the desired transferspeed of the com pressed video stream . The followingtransfer speed can be selected:
Value Description
000 001 010 011 100 101 110 111
ReservedNorm al speed (1X)2X speed3X speed4X speed5X speedReservedReserved
LOCK: Indicates whether the VCR is being servolocked or not during the data transfer.
Value Description
0 1
VCR servo unlockedVCR servo locked
AUDIO INVALID: Indicates the validity of the audiodata. W hen the AUDIO INVALID flag is active (1), thereceiver shall not attem pt to decode the audio data.
Value Description
0 1
Audio data validAudio data invalid
VIDEO INVALID: Indicates the validity of thevideo data. W hen the VIDEO INVALID flag isactive (1), the receiver shall not attem pt to decodethe video data.
Value Description
0 1
Video data validVideo data invalid
4.3.6 Com m on param eters
Other param eters contained in bytes 3 to 10 arecom m on inform ation to the international standard(IEC 61834).
4.4 Data slot
Each data slot consists of 280 words, and shall startfrom the word num ber address shown below. Thedata shall be contained in the first 256 bytes, andthe last 24 bytes are reserved for future exten-sions.
W ord address Num ber
Slot 1 Slot 2 Slot 3 Slot 4 Slot 5
16 296 576 856 1136
M SB LSB
Byte 1 Secondary data type
Btye 2 0 0(RESERVE)
VIDEOINVALID
AUDIOINVALID LO CK TRANSFER M O DE
Byte 3 V50/60
VSTYPE
A50/60
ASTYPE AP3 AP2 AP1 APT
Byte 4 FF FS V RECM O DE BCSYS DISP
Byte 5 A-1LF
A-1CHN
A-1PA
A-1AUDIO M O DE
Byte 6 A-1 RECST
A-1 RECEND
A-1 RECM O DE
A-1EF
A-1SM P
A-1Q U
Byte 7 A-1DRF
A-1SPEED
Byte 8 A-2LF
A-2CHN
A-2PA
A-2AUDIO M O DE
Byte 9 A-2 RECST
A-2 RECEND
A-2 RECM O DE
A-2EF A-2 SM P A-2 Q U
Byte 10 A-2DRF
A-2SPEED
Table 3 -- Control data block structure
SM PTE 322M -1999
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Rec. ITU-R BT.1617 7
4.5 Endcode
The endcode as specified in SM PTE 305M shall bepresent at the word num ber address 1416 on line 525for the 525/60 system , or line 625 for the 625/50system .
Param eters Length Value
Encode 1 word [30Ah]
5 Transm ission Form at
The following clause describes the overall transm is-sion form at and the detailed data structure of thecom pressed video stream .
5.1 Digital interface form at (DIF)
The data structure of the video, audio, and subcodein the DIF blocks shall be as specified in IEC 61834-2.However, the 3-byte ID shall not be carried over theinterface (see figures 4, 5, and 6). The DIF blocks shallbe m apped onto the data slots using a fram e-boundedalgorithm , which is different in sequence from the onespecified in IEC 61834-2.
5.2 525/60 system
The data block shall be transm itted from line 12through line 525, provided that valid data shall notexist on lines 9 - 11 and 272 - 274 for the 525/60 systemas shown in figure 7. The areas in lines 247- 271 and510 - 8 are reserved for future extensions.
5.2.1 Video sections
The video sections are contained in lines 12 - 223 and275 - 486 (see figure 8):
(n, V0) -- (n, V134); n = 0 to 9
5.2.2 SC/VAUX sections
The SC/VAUX sections are contained in lines224 - 231 and 487 - 494 (see figure 9):
(n, SC0), (n, SC1), n, VA0), (n, VA1), (n, VA2);n = 0 to 9
5.2.3 Audio/AAUX sections
The audio/AAUX sections are contained in lines232 - 246 and 495 - 509 (see figure 9):
(n, A0) -- (n, A8); n = 0 to 9
5.3 625/50 system
The data block shall be transm itted from line 8 throughline 625, provided that valid data shall not exist onlines 5 - 7 and 318 - 320 for the 625/50 system asshown in figure 10. The areas in lines 289 - 317 and602 - 4 are reserved for future extensions.
5.3.1 Video sections
The video sections are contained in lines 8 - 261 and321 - 574 (see figure 11):
(n, V0) -- (n, V134); n = 0 to 11
5.3.2 SC/VAUX sections
The SC/VAUX sections are contained in lines 262 -271 and 575 - 584 (see figure 12):
(n, SC0), (n, SC1), (n, VA0), (n, VA1), (n, VA2);n = 0 to 11
5.3.3 Audio/AAUX sections
The audio/AAUX sections are contained in lines 272- 288 and 585 - 601 (see figure 12):
(n, A0) -- (n, A8); n = 0 to 11
SM PTE 322M -1999
Page 5 of 13 pages
8 Rec. ITU-R BT.1617
Figure 4 -- Data in the video sections
Figure 5 -- Data in the SC/VAUX sections
Figure 6 -- Data in the audio/AAUX sections
SM PTE 322M -1999
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Rec. ITU-R BT.1617 9
Figure 7 -- Transm ission form at for 525/60 system
SM PTE 322M -1999
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10 Rec. ITU-R BT.1617
Figure 8 -- Video sections for 525/60 system
SM PTE 322M -1999
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Rec. ITU-R BT.1617 11
Figure 9 -- SC/VAUX and audio/AAUX sections for 525/60 system
SM PTE 322M -1999
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12 Rec. ITU-R BT.1617
Figure 10 -- Transm ission form at for 625/50 system
SM PTE 322M -1999
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Rec. ITU-R BT.1617 13
Figure 11 -- Video sections for 625/50 system
SM PTE 322M -1999
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Figure 12 -- SC/VAUX and audio/AAUX sections for 625/50 system
SM PTE 322M -1999
Page 12 of 13 pages
Rec. ITU-R BT.1617 15
Annex A (inform ative)Bibliography
ANSI/SM PTE 259M -1997, Television ---- 10-Bit 4:2:2 Com -ponent and 4fsc C om posite Digital Signals ---- Serial DigitalInterface
SM PTE RP 168-1993, Definition of Vertical Interval Switch-ing Point for Synchronous Video Switching
ITU -R BT.656-3, Interface for D igital C om ponent VideoSignals in 525-Line and 625-Line Television System s O per-ating at the 4:2:2 Level of Recom m endation ITU-R BT.601
SM PTE 322M -1999
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